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http://dx.doi.org/10.5395/rde.2012.37.3.155

Effect of moisture and drying time on the bond strength of the one-step self-etching adhesive system  

Lee, Yoon (Department of Conservative Dentistry, Yonsei University Wonju College of Medicine)
Park, Jeong-Won (Department of Conservative Dentistry, Yonsei University College of Dentistry)
Publication Information
Restorative Dentistry and Endodontics / v.37, no.3, 2012 , pp. 155-159 More about this Journal
Abstract
Objectives: To investigate the effect of dentin moisture degree and air-drying time on dentin-bond strength of two different one-step self-etching adhesive systems. Materials and Methods: Twenty-four human third molars were used for microtensile bond strength testing of G-Bond and Clearfil $S^3$ Bond. The dentin surface was either blot-dried or air-dried before applying these adhesive agents. After application of the adhesive agent, three different air drying times were evaluated: 1, 5, and 10 sec. Composite resin was build up to 4 mm thickness and light cured for 40 sec with 2 separate layers. Then the tooth was sectioned and trimmed to measure the microtensile bond strength using a universal testing machine. The measured bond strengths were analyzed with three-way ANOVA and regression analysis was done (p = 0.05). Results: All three factors, materials, dentin wetness and air drying time, showed significant effect on the microtensile bond strength. Clearfil $S^3$ Bond, dry dentin surface and 10 sec air drying time showed higher bond strength. Conclusions: Within the limitation of this experiment, air drying time after the application of the one-step self-etching adhesive agent was the most significant factor affecting the bond strength, followed by the material difference and dentin moisture before applying the adhesive agent.
Keywords
Air-drying time; HEMA; Moisture control; One-step self-etching;
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